The Witch Fuse update has officially arrived in Steal a Brainrot, and it’s easily the biggest Halloween feature of the year.
This limited-time event replaces the old Craft Machine and introduces a brand-new way to combine brainrots to create rare, spooky, and even Secret-tier variants.
If you’re wondering how to use the Witch Fuse or what exactly it does, this guide will walk you through everything step-by-step, from how the fusion works to tips for getting the best results.
What Is the Witch Fuse in Steal a Brainrot?
The Witch Fuse is a special Halloween machine located in the center of the map. It allows players to fuse four existing brainrots to create one brand-new unit.
Unlike the older Craft Machine, the Witch Fuse gives you access to over 20 new Halloween brainrots, including four Secret fusions that can only be obtained during this event.
The Witch NPC manages the entire process, stirring her bubbling cauldron while you sacrifice your chosen brainrots.
Once you begin the fusion, you’ll see potential outcomes, mutation chances, and special traits before confirming your selection.
Keep in mind that the Witch Fuse is only available for a limited time — from October 12 to October 17, 2025 (US time).
Once the event ends, you won’t be able to use it again.
How to Use the Witch Fuse in Steal a Brainrot
Using the Witch Fuse is simple once you understand how it works.
Here’s a step-by-step breakdown:
1. Head to the Witch Fuse Location
Go to the middle of the map, where the Witch NPC and her cauldron are set up.
You’ll see the glowing purple fusion area surrounded by pumpkins and candles.
2. Select Four Brainrots to Fuse
Choose any four brainrots from your collection.
You can mix different rarities, but remember that the rarer your inputs are, the better your output chances.
3. Submit Them to the Witch NPC
Bring each brainrot one by one to the cauldron.
Once all four are submitted, the Witch Fuse interface will display possible results.
4. Check Possible Outcomes
You’ll see several potential brainrots listed, each with a percentage chance of success (for example, 85% Jacko Jack Jack or 10% Los Mobilis).
The rarer and better your materials, the higher the odds for unique or Secret results.
5. Review Mutations and Traits
On the right side of the screen, you’ll find two panels — Mutations and Traits.
- Mutations alter how your brainrot looks, with variants like Rainbow, Candy, or Gold.
- Traits add unique accessories or visual effects, such as Sombrero, Wings, or Taco-style auras.
6. Confirm Fusion and Pay the Cost
Each fusion costs in-game money and takes a set amount of time.
Stronger combinations take longer and cost more to complete.
Once you pay the fee, the Witch will begin the fusion process.
7. Wait for the Fusion to Complete
After a short waiting period, your new brainrot will appear from the cauldron, possibly with a new look, mutation, or trait.
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How the Witch Fuse Results Work
Every fusion result in Steal a Brainrot is based on probabilities.
The four brainrots you choose determine the pool of possible outcomes.
For example:
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Fusing multiple Legendary or Secret brainrots increases your chance of rolling high-tier results.
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Using event-exclusive brainrots may unlock limited fusions that can’t be crafted elsewhere.
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Adding mutated or traited brainrots boosts your odds of producing new visual effects.
Essentially, the Witch Fuse is a high-risk, high-reward system — perfect for players looking to experiment with rare combinations.
Tips for Getting the Best Witch Fusions
Here are a few practical strategies to improve your chances while saving time and money:
1. Start with Common Brainrots First
If you’re new to fusion, begin with low-rarity brainrots. It helps you learn the process without wasting your best ones.
2. Save Secret and Event Brainrots for Special Combos
Secret-tier brainrots heavily increase your chances of creating rare fusions or special mutations. Use them wisely once you understand the fusion system.
3. Always Check the Percentage Chances
Before confirming the fusion, look at the result percentages. Anything above 80–90% is generally a safe bet. Going for rare 5–10% fusions is risky but can yield exclusive results.
4. Experiment During Event Hours
Since the Witch Fuse is only active until October 17, try different combinations throughout the event window to collect as many limited brainrots as possible.
5. Watch for Hidden Bonuses
Some brainrots have hidden synergies. For example, combining themed brainrots (like Halloween or Extinct variants) may slightly improve mutation odds.
Why You Should Use the Witch Fuse
The Witch Fuse isn’t just a cosmetic feature — it’s one of the fastest ways to grow your collection and get exclusive limited units.
Some of the best reasons to use it include:
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Access to 20+ new fusable Halloween brainrots
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Chance to obtain 4 new Secret brainrots
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Potential for mutated and traited variants
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Temporary availability — only for one week
It’s also the key to unlocking La Spooky Grande, the limited Halloween fusion that requires multiple event brainrots.
Final Thoughts
The Witch Fuse event is a short-term but major addition to Steal a Brainrot.
It brings a creative mix of crafting, randomness, and Halloween magic that rewards experimentation.
If you want the best results:
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Combine high-rarity brainrots
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Keep an eye on fusion percentages
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Participate early before the event ends
Don’t miss this chance to fuse your way to exclusive Halloween brainrots, including the mysterious La Spooky Grande before stocks run out.
Ankit is an engineer by profession and blogger by passion. He is passionate to do all the stuff such as designing the website, doing the SEO, researching for the content, writing tech blog posts and more.
